期刊
MICROMACHINES
卷 10, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/mi10120859
关键词
giant magnetoimpedance sensor; brushless direct-current motor; rotational velocity; square wave; sawtooth wave
类别
资金
- National Youth Natural Science Foundation [61703266]
- National Natural Science Foundation of China [61573236]
- National Science Fund for Distinguished Young Scholars [61625304]
Reports on measurements of the rotational velocity by using giant magnetoimpedance (GMI) sensors are rarely seen. In this study, a rotational-velocity sensing system based on GMI effect was established to measure rotational velocities of brushless direct-current motors. Square waves and sawtooth waves were observed due to the rotation of the shaft. We also found that the square waves gradually became sawtooth waves with increasing the measurement distance and rotational velocity. The GMI-based rotational-velocity measurement results (1000-4300 r/min) were further confirmed using the Hall sensor. This GMI sensor is capable of measuring ultrahigh rotational velocity of 84,000 r/min with a large voltage response of 5 V, even when setting a large measurement distance of 9 cm. Accordingly, the GMI sensor is very useful for sensitive measurements of high rotational velocity.
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